WO2002030653A2 - Procede d'application d'enveloppe thermoactivable - Google Patents

Procede d'application d'enveloppe thermoactivable Download PDF

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Publication number
WO2002030653A2
WO2002030653A2 PCT/CA2001/001425 CA0101425W WO0230653A2 WO 2002030653 A2 WO2002030653 A2 WO 2002030653A2 CA 0101425 W CA0101425 W CA 0101425W WO 0230653 A2 WO0230653 A2 WO 0230653A2
Authority
WO
WIPO (PCT)
Prior art keywords
coating
sleeve
heating
heat
applying
Prior art date
Application number
PCT/CA2001/001425
Other languages
English (en)
Other versions
WO2002030653A3 (fr
Inventor
Dilip K. Tailor
Amarjit Tathgur
Original Assignee
Shawcor Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shawcor Ltd. filed Critical Shawcor Ltd.
Priority to AU2001295328A priority Critical patent/AU2001295328A1/en
Publication of WO2002030653A2 publication Critical patent/WO2002030653A2/fr
Publication of WO2002030653A3 publication Critical patent/WO2002030653A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/02—Thermal shrinking
    • B29C61/025—Thermal shrinking for the production of hollow or tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/0047—Preventing air-inclusions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/0065—Heat treatment
    • B29C63/0069—Heat treatment of tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/38—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses
    • B29C63/42—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor by liberation of internal stresses using tubular layers or sheathings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/02—Welded joints
    • F16L13/0254—Welded joints the pipes having an internal or external coating
    • F16L13/0272—Welded joints the pipes having an internal or external coating having an external coating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/20—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics
    • F16L47/22—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics using shrink-down material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
    • F16L58/181—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for non-disconnectible pipe joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0811—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using induction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0049—Heat shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B29L2009/003—Layered products comprising a metal layer

Definitions

  • the present application relates to methods of applying a heat activatable covering to a substrate coated with a heat sensitive coating. More especially, but not exclusively, the invention relates to application of a heat activatable and shrinkable sleeve in circumstances in which the installation procedure requires preheating of a tubular article to a temperature greater than the melting or softening point of its coating, or of any of the components thereof, in the case in which the coating is a multi- component system.
  • the coating may comprise an inner or secondary adhesive layer and an outer polyolefin coating.
  • polypropylene pipe coatings usually termed mainline coatings
  • mainline coatings have been developed for use in providing a protective coating on pipelines used for conveying products at high temperature, for example at greater than 100°C.
  • heat shrinkable polypropylene sleeves on the joint area between two welded pipe sections.
  • the application of the heat shrinkable sleeve or other covering may require heating the substrate such as the metal pipe to a temperature that is in excess of the melting or softening point of the outer polypropylene coating or of an underlying adhesive material coating, and it has been found that this risks impairment of the mainline polypropylene coating.
  • Method of applying a heat activatable covering to an area of a substrate article coated with a heat sensitive coating having a melting point or a softening temperature lower than an activation temperature for said covering said method including the step of maintaining said covering in contact with said area including a portion of said heat sensitive coating while said portion of said coating is at least said activation temperature, and further including the step of heating said portion to at least at said activation temperature while said coating has a heat resistant mold structure applied thereon, at least adjacent said portion.
  • This method can be used particularly advantageously where the procedure of installation of a sleeve or other covering applies a temperature in excess of the heat sensitive coating's melting point or softening temperature. It has been found that, in such cases, there may be a tendency for the main line coating to become damaged, corrugated or wrinkled outwardly from the sleeve or other covering. Corrugation or wrinkling of the coating is particularly undesirable, since it can render the coated article susceptible to failure. For example, it may make the coating more liable to failure as a result of soil stress in service.
  • the mold structures allow the sleeve or other covering to be applied successfully, even where extreme temperatures are applied in excess of the melting point or softening temperature of the coating without impairing the uniformity, continuity or profile of the mainline coating.
  • the invention provides a method of applying a heat shrinkable sleeve to a joint area between two tubular articles, wherein said articles outwardly from said joint area are coated with a heat sensitive coating and adjacent said area are bare of said coating, comprising: applying a heat resistant spacer structure to bear on a region of each coating outwardly from said joint area; applying said sleeve,- initially heating and partially heat shrinking said sleeve; removing the spacer structure; and further heating and shrinking said sleeve; wherein each spacer comprises a base portion having an inner side for bearing on said region of the coating, an intermediate bridge portion offset outwardly from said inner side whereby said intermediate portion is spaced outwardly from said coating, and an end portion offset inwardly from said base portion for bearing on said bear oven.
  • This procedure is again particularly advantageous when, in the course of the sleeve application, the substrate is raised to a temperature in excess of the melting point or softening temperature of the coating or of any component of the coating.
  • the spacers allow gases to escape from the region between the inner side of the sleeve and the outer side of the substrate as the sleeve shrinks, while avoiding deformation of the coating, since the intermediate portion of the spacer is spaced away from and does not impinge on or apply pressure on the heated coating.
  • the base portion may bear indirectly on the outer region, for example through mold structure applied in accordance with the first aspect of the invention.
  • Figure 1 is a side elevation, partially in section, showing a weld joint area and mold structures as employed in a first form of method in accordance with the invention.
  • Figure 2 is a partially perspective view of the weld joint area of Fig. 1, showing the application of spacer structures.
  • Figure 3 is a perspective view of the joint area of Fig. 2, showing a succeeding stage wherein a sleeve has been applied on the joint area.
  • Figure 4 is a partially perspective view of the joint area of Fig. 3 having an induction heater coil applied thereover .
  • Figure 5 is a side elevational view, partially in section, of the joint area of Fig. 4 after removal of the induction heater, wherein the left half of the Figure shows heat shrinking of the sleeve with the spacer and mold structures in place.
  • Figure 6 is a side elevational view, partially in section, showing mold structures as employed in a second form of the method of the invention.
  • Figure 7 is a side elevational view, partially in section showing the completed joints.
  • Fig. 1 shows pipe sections 11 and 12 welded together at a weld joint 13.
  • each pipe section 11 and 12 has a polyolefin, for example polypropylene pipe mainline coating 14 and 16 thereon.
  • the coatings 14 and 16 may be of the multi-component type, and may comprise a outer polypropylene coating on an inner polypropylene adhesive coating, the latter being applied directly on the metal pipe.
  • the ends of the coating 14 or 16 adjacent the weld joint area are chamfered, as indicated by reference numerals 17 and 18, respectively.
  • the end portions 19 and 21 of the pipe are bare of the coating 14 and 16, in order to allow the weld 13 to be accomplished. It is desired to apply a heat shrinkable sleeve protecting the bare portions 19 and 21 and the weld 13 and rendering them resistant to corrosion.
  • a curable primer composition for example a mixed two part epoxy primer
  • the epoxy coating is then preferably force cured by application of heat to the primer coating, for example by application of a propane torch flame in order to heat the primer to a temperature that ensures the primer is cured before the remaining stages of the installation procedure.
  • the cured epoxy coating provides improved corrosion resistance and a key to promote adherence of the subsequently applied sleeve components.
  • a heat resistant mold structure is applied on each coating 14 and 16 axially outwardly from the joint area.
  • the mold structures 22 and 23 are spaced apart generally symmetrically with respect to the weld 13 a distance slightly greater than the length of the sleeve 24 to be applied to the joint area, so that, as best seen in Figs. 3 and 5, the inner ends of the mold structures 22 and 23 are spaced slightly longitudinally outwardly from the ends of the sleeve 24.
  • the inner sides of the mold structures 22 and 23 provide a cylindrical inner surface that conforms closely to the outer cylindrical surface of each mainline coating 14 and 16.
  • the mold structures 22 and 23 are preferably of sufficient width to extend longitudinally outwardly over the entire portion of the coating 14 and 16 that, in the installation procedure, is exposed to potentially deleterious temperature.
  • the molds 22 and 23 may have a width, measured in the longitudinal direction of the pipe of about 5 to 30 cm, more typically about 15 cm.
  • a pair of heat- resistant spacer members 26 and 27 may be applied to the joint area to provide a channel allowing gases to escape
  • Sleeves and closure sheets are described, for example, in Steele et al U.S. Patent 5,411,777, Steele et al U.S. Patent 5,175,032 and in Tailor U.S. Patent 4,472,468, the disclosures of all of which are incorporated by reference herein.
  • the sleeve 24 comprises an outer backing comprising a heat shrinkable cross-linked polyolefin, for example polypropylene, having on a side that is applied inwardly toward the joint area a functional coating, such as a heat-activatable mastic, sealant or adhesive.
  • a heat shrinkable cross-linked polyolefin for example polypropylene
  • a functional coating such as a heat-activatable mastic, sealant or adhesive.
  • the overlapped ends 33 and 34 and closure sheet 36 are fusion bonded together, for example by heating to weld them together with a propane torch flame. Further heating, for example with a propane torch flame is then preferably applied to the sleeve, whether a wraparound or pre-formed cylindrical sleeve, to at least partially shrink the sleeve onto the assembly of the pipe sections and the spacers 26 and 27, so that most of the inner side of the sleeve is shrunk down in tight conformity with the bare portions 19 and 21 and into intimate contact with the adjacent portions of the coatings 14 and 16, as seen in the left hand half of Fig. 5.
  • Such elevated temperature will usually be at least an activation temperature for the sleeve 24 or its functional coating.
  • activation temperature may be a temperature at which the functional coating will wet and bond to the coatings 14 and 16 and will wet and bond to the substrate. Problems arise when such elevated temperature is in excess of the melting or softening point of the coating 14 or 16, or of at least one of its components.
  • the coating 14 or 16 may comprise, two or more layers. For example it may comprise an outer crystalline coating, and an inner or secondary amorphous adhesive layer between the outer layer and the substrate.
  • the coating may or may not comprise a layer such as cured resin, e.g., epoxy resin, between the substrate and the adhesive layer. It has been found that raising the temperature of the coating 14 or 16 above either the softening point of the adhesive material or the melting point of the polyolefin material renders the coating susceptible to undesired deformation, for example as evidenced by wrinkling, corrugation, and the like undesired deformation.
  • melting point applies normally to crystalline polymers that have a discrete crystalline melting point, such as can be determined, for example by differential scanning calorimetry measurement. Many materials, such as, for example, many non-crystalline amorphous materials such as many adhesives, do not have a discrete melting point. In such a case, the temperature at which the material softens and becomes susceptible to undesired deformation can be defined in terms of the softening temperature of the material .
  • melting point and softening temperature herein is meant melting point as determined by differential scanning calorimetry (DSC) measurement and the VICAT softening temperature, respectively.
  • such undesired deformation is avoided by employing the heat resistant mold structures 22 and 23 that retain the original configuration, profile and continuity of the coatings 14 and 16 during the stage of heating the coatings to the activation temperature.
  • heating is effected by heating the substrate.
  • induction heating is employed. Referring to Fig. 4, this shows an induction heating coil 37 that is slid along the pipeline and positioned over the joint area.
  • the induction coil 37 is energized using a current strength and a duration of energization sufficient to heat the metal pipe substrate to a desired temperature at which the coatings 14 and 16 and the substrate are heated such that the sleeve 24 or a component thereof, such as a functional coating on the inner side of the sleeve, bonds adequately to the bare portion 19 and 21, to the weld joint 13, and to the adjacent portions of the coatings 14 and 16.
  • the metal of the pipes 11 and 12 is heated, in the heated area, to a desired temperature substantially uni ormly throughout the entire wall thickness of the pipe .
  • relatively low frequency induction heating for example less than about 10 KHz, more typically about 0.5 to 6 KHz and more preferably about 1 to 3 KHz .
  • the thorough heating of the pipe wall ensures that the joint area and the components of the joint remain adequately hot until the joint is completed.
  • the metal of the pipe wall is raised throughout its entire thickness to a temperature of approximately 180 to 220°C, more typically about 200°C. It may be noted that a typical melting point of an outer polypropylene coating 14 or 16 may be about 160°C, while a softening temperature of an inner adhesive layer of coating 14 or 16 may be about 150°C.
  • a temperature gradient is established wherein the temperature of the substrate diminishes outwardly from the center region of the induction coil.
  • the coatings 14 and 16 in the region overlapped by the sleeve and slightly outwardly beyond the edges of the sleeve are heated to a temperature in excess of the activation temperature for the sleeve 24, e.g. about 165°C.
  • a temperature in excess of the activation temperature for the sleeve 24 e.g. about 165°C.
  • the area of the coatings 14 and 16 that is heated to above the melting point or softening temperature of the coatings 14 and 16, or of any component thereof, does not extend outwardly beyond the mold structures 22 and 23.
  • the coil is deenergized and removed from the joint area e.g. is slid along the pipe.
  • the spacers 26 and 27 are then carefully removed.
  • the spacers 26 and 27 provide channels allowing air or other gases to exit from the space between the sleeve 24 and the external surfaces of the portions 19 and 21, so that no gas bubbles remain trapped within the sleeve.
  • the entire sleeve 24 may be heated for example with a propane torch flame in order to completely shrink the sleeve 24 and ensure that" there is good contact between pipe sections 11 and 12 including the coatings 14 and 16 and the portions of the sleeve 24 that were adjacent the spacers 26 and 27.
  • the mold structures may normally be removed.
  • Pressure may then if desired be applied to the exterior of the sleeve 24 while the sleeve 24 is still hot and soft in order to ensure intimate contact between the sleeve 24 or its components and the underlying portions of the pipe sections 11, 12 and the weld 13.
  • Such pressure may be applied with a hand roller rolled circumferentially around the central portion of the joint area and subsequently longitudinally outwardly therefrom, and longitudinally along the closure strip 36, if present.
  • adhesive material or other functional coating material on the inner side of the sleeve 24 will be visible as having oozed out beyond the end portions of all longitudinal end edges of the sleeve 24 and having wetted the adjacent surface of the coatings 14 and 16.
  • the completed joint is as shown in the right hand half of Fig. 5 with the sleeve 24 and its components shrunk down onto and bonding to the pipe sections 11 and 12 including the coatings 14 and 16.
  • the mold structures may desirably be formed of any preferably flame and heat resistant material that will serve to confine the coatings 14 and 16 and preserve their as-manufactured mainline form when the substrate is heated above the melting point or softening temperature referred to above, and that can be removed from the pipe or other tubular article after the coatings 14 and 16 have cooled.
  • the mold structure should be electrically insulating or non- conductive and substantially non-responsive to induction fields.
  • the molds 22 and 23 comprise silicone rubber tapes or bands that are wound tightly around the coatings 14 and 16.
  • the rubber tapes or bands may contain a mesh or fibrous reinforcement, for example, a glass fiber mesh reinforcement, in order to improve their resistance to tearing.
  • the silicone rubber tapes or bands may be provided with a fastening system such as a conventional adhesive tape fastening, with a plastic buckle or with a hook and loop (e.g. VELCRO trademark) fastener system in order to retain an outer end of the silicone rubber tape or band so that the tape or band is held tightly wound around the exterior of the coatings 14 and 16. It is found, however, that with the silicone rubber tapes or bands, a fastening system is often not required, since the silicone rubber material has a high coefficient of friction and the end tends to engage tightly on an outer side of the remainder of the winding.
  • the silicone rubber material may be used in place of the silicone rubber material, for example glass fiber-reinforced polyamide or aramid (KEVLAR trademark) fiber reinforced high temperature plastics. Since it is desired that the mold structure should not bond to the coatings 14 and 16, and be easily separable from the coatings 14 and 16 after cooling, if necessary the inner surfaces of the mold structure material may be coated or lined with a high temperature resistant release coating or lining, for example of polytetrafluoroethylene (TEFLON trademark) .
  • TEFLON trademark polytetrafluoroethylene
  • each mold structure may comprise hinging clam-shell like members, molded for example from epoxy resin, that in use may be applied around the coatings 14 and 16 and the hinged halves retained in a cylindrically closed position. After completion of the operation the halves are unfastened, and pivoted to an open position in which they can be removed from the tubular articles .
  • spacers 26 and 27 serve to space a portion of the sleeve 24 away from the outer surfaces of the pipe sections 11 and 12, allowing gases to escape, and are designed to space the bridge portions 29 away from such surfaces and avoid applying pressure on the coatings 14 and 16 while the substrate is above the softening temperature or melting pointy referred to above. In this way, the coatings 14 and 16 are not deformed inwardly as a result of such pressure.
  • the spacers 26 and 27 may be formed of any material that will not adhere to the portions with which it is in contact and which will retain its structural integrity at the temperatures to which it is subjected. Where induction heating is employed, as in the example described above the spacers should be of a material that is non-responsive to induction fields, for example is electrically insulative. Preferably, for example, the spacers may be formed of polytetrafluoroethylene (TEFLON trademark) .
  • TEFLON trademark polytetrafluoroethylene
  • the spacers may be employed with procedures similar to those described above in detail with reference to Figs. 1 to 5 but modified in that the substrate is not heated to a temperature greater than the melting point or softening temperature referred to above outwardly from the ends of the sleeve 24.
  • the base portions 28 of the spacers may engage directly on the relatively unheated outer regions of the coatings 14 and 16.
  • the spacers 26 and 27 are used with and applied on the outer sides of the mold structure 22 and 23 as described in detail above.
  • the mold structures 22 and 23 are applied adjacent the chamfered ends 17 and 18 of the coating.
  • the induction coil 37 is then brought into position and the assembly is induction heated in the absence of the sleeve.
  • the area of the coatings 14 and 16 that is heated to above the activation temperature for the sleeve 24 extends outwardly slightly beyond the position that the ends of the subsequently applied sleeve 24 will occupy.
  • the portions of the coatings 14 and 16 that are heated to above their melting point or softening temperature do not extend outwardly beyond the outer ends of the mold structures 22 and 23.
  • the substrate and coating may be preheated with mold structure applied on the coating. The mold structure is then removed and the patch applied to the coating while the latter remains at a temperature above the patch's activation temperature.
  • induction heating is used to heat the substrate and a torch flame is used to heat the sleeve 24 or other covering
  • other heating arrangements can of course be employed, for example conventional ovens.

Abstract

L'invention concerne un procédé d'application d'une enveloppe thermoactivable sur une zone d'un substrat revêtu d'un revêtement thermosensible dont le point de fusion, ou la température de ramollissement, est inférieur à la température d'activation de ladite enveloppe. Cette dernière est maintenue intimement en contact avec la zone comprenant une partie du revêtement thermosensible, ladite partie étant au moins à la température d'activation susmentionnée. Avant ou après l'application de l'enveloppe, la partie du revêtement est chauffée à au moins la température d'activation, tandis qu'une structure de moulage thermorésistante est appliquée sur ledit revêtement, jouxtant au moins la partie du revêtement.
PCT/CA2001/001425 2000-10-10 2001-10-10 Procede d'application d'enveloppe thermoactivable WO2002030653A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001295328A AU2001295328A1 (en) 2000-10-10 2001-10-10 Method of applying heat activatable covering

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US68478800A 2000-10-10 2000-10-10
US09/684,788 2000-10-10

Publications (2)

Publication Number Publication Date
WO2002030653A2 true WO2002030653A2 (fr) 2002-04-18
WO2002030653A3 WO2002030653A3 (fr) 2002-10-03

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PCT/CA2001/001425 WO2002030653A2 (fr) 2000-10-10 2001-10-10 Procede d'application d'enveloppe thermoactivable

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AU (1) AU2001295328A1 (fr)
WO (1) WO2002030653A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109454781A (zh) * 2018-12-18 2019-03-12 上海艾港风电科技发展有限公司 热缩管自动加热装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03244527A (ja) * 1990-02-23 1991-10-31 Dai Ichi High Frequency Co Ltd 熱収縮性被覆材の溶着方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 036 (M-1205), 29 January 1992 (1992-01-29) -& JP 03 244527 A (DAI ICHI HIGH FREQUENCY CO LTD), 31 October 1991 (1991-10-31) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109454781A (zh) * 2018-12-18 2019-03-12 上海艾港风电科技发展有限公司 热缩管自动加热装置

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Publication number Publication date
WO2002030653A3 (fr) 2002-10-03
AU2001295328A1 (en) 2002-04-22

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